city vs Kazan

city and Kazan both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Kazan	Yes	No	No	No

city (noun)	Kazan (noun)
people living in a large densely populated municipality	an industrial city in the European part of Russia, it is the capital and largest city of the Republic of Tatarstan, Russia
a large and densely populated urban area; may include several independent administrative districts	United States stage and screen director (born in Turkey) and believer in method acting (1909-2003)
an incorporated administrative district established by state charter